25 



ON TWO PEEOCCUPIED SPECIFIC NAMES IN GASTROPODA 



By G. K. GuDE, F.Z.S. 



Read 12th January, 1912. 



A NEW species of Ilappia, from Sao Paulo, South Brazil, was 

 described by Professor Pilsbry in Proc. Acad. Nat. Sci. Philadelphia, 

 1900, p. 38.5, pi. xii, figs. 1-3, under the designation Ilappia Iherwgi. 

 In 1888, liowever, Clessin published Hyalinia Iheringi in Malak. 

 Blatter, neue Polge, vol. x, p. 166, from Taguara, South Brazil, 

 This species is undoubtedly also a Hnppia, since Clessin compares it 

 with Ilappia ammonifonnis, Orbigny, which he also assigns to Hyalinia, 

 and since, to judge from the rather scanty desci'iption by Clessin, the 

 two species, although evidently near allies, are not co-specific, and 

 Clessin's name having priority, it becomes necessary to rename Pilsbry's 

 species, for which I propose Happia Pilshryi, nom. mut. In 1910 

 D'Ailly, in working out the moUusca collected by the Kilimandjaro- 

 Meru Expedition, described Helix alieniis (Wissens. Ergebn. Schwed. 

 Zoo). Exped. Kilimandjaro, ^leru, Deutsch-Ost- Africa, Band i, No. 6, 

 Mollusca, p. 17). Now PfeifPer as far back as 1841 published Helix 

 aliena, a manuscript name of Ziegler's (Symb. Helic, vol. i, p. 39), 

 wliich was subsequently relegated by him to the synonymy of Helix 

 umhilicata, Montagu \_Pyramidula rupentris (Drap.)] (Mon. Helic. 

 Vivent., vol. i, p. 86, 1848). Since the Rules of Nomenclature adopted 

 in zoology do not permit the use of a synonym to designate another 

 species, L propose to substitute for D'Ailly's species Helix Ailhji, 

 nom. mut. 



